1. Self-drill screws, self-tapping screws Standard: Din6901, din7971, din7972, din7973, din7976, din7981, din7982, din7983; din7504; din7513, din7516 etc. Our entire range of fasteners are made of carbon steel, alloy&stainless steel, aluminum, brass, and other special materials. Production is carried out in compliance with din, ifi, ANSI/asme, bs, ISO, jis specifications Packing: G. W.:25kgs/carton in wooden package or small mail box according to customer inquire Surface treatment: Plain, black, zinc, hot dip galvanized, dacromat, elctro galvanized etc.